body{
  padding: 0px;
  margin: 0px;
}

.mainDiv{
  display: flex;
  width: 100%;
}
.leftNav{
  width: 16%;
  background-color: #c0c0c0;
  color:#333;
  font-size:24px;
  height: 1000px;
  padding: 20px;
}
.rightMain{
  width: 84%;
  height:1000px;
  background-color: #fff;
  font-size:20px;

}
.topNav{
  height:50px ;
  background-color: #cfdefd;
}
.topNav ul{
 display: flex; 
 margin: 0px;
 padding: 0px;
}
.topNav li{
 padding: 10px;
 text-align: center;
 list-style: none;
}
.videoContent{
   padding:20px;
}